Safety device for oil-pumps.



K. D. FULLER SAFETY DEVICE FOR OiL PUMPS.

APPLIcAnoN msn Auaze. 1915.

l ,242,53. Patented Ot. 9, 1917.

this invention,

KENNETH D. FULLER, 0F WHITTIEB, CALIFORNIA..

t DEVIG FOB. OIL-PUMPS.

Speciileation of Letters Patent.

rammen eet. s, reir.

Application led August 26, l1916. Serial No. 117,048.

To all whom 'it may concern.' Y

Be it known that I, KENNETH D. FULLER a citizen of the United States,residing at Tint-` tier,- in the county of Los Angeles and State 5 oCalifornia, haveinvented certain new and useful Improvements in SafetyDevices for Oil-Pumps; and I do hereby declare the following to be afull, clear, and exact descripltion `of the inventiomf'such as willenable others skilled in the art towhich it appertains .to make and usefthe same.

inventionettes to a saelty device' or oi umps an t e present app icationis for a pmodified form of the invention claimed in and as to the commonsubjectmatter is a division ofan application'iled by me August 10th,1915, Serial #44,772

-The object of the present invention is to. improve the construction ofsafety devices for oil pumps and to provide a simple, practical andeliicient safety device of strong, durable and comparatively inexpensiveconstruction adapted to be readily applied to oil pumps and capable inevent of the o the bottom of the well. v

It is also ani object of the invention to provide a safety device ofthis character which will permit the operation of the pump at a moderaterate of speed such as is ordinarily employed in operating pumps of thischaracter without causing the device to engage ,the well casing andwhich will not interfere with the free flow of oil through the pump. f ly 0 With these and other objects in view, the

invention consists in the construction and novel combination of partshereinafter fully "described,illustrated in the accompanying drawing,and pointed out in the claims hereto appended; it being understood thatvarious changes in the form, proportion, size and minor detailsv ofconstruction, within the scope of the claims, may be resorted tolwithout departing from the spirit or sacri.- ficing any of theadvantages of the invention.

In the drawing i Figure l is a vertical sectional view of a portion ofan 'oil pump provided with a breakage of the operating means forrecipsafety device constructed in accordance with Fig. 2 is anelevation` of thesafety device, the same being applied to the innerreciprocatory tube,

Fig. 3 is a horizontal sectional View on the line 3 3 lof Fig. l',

Fig. 4 is a detail view illustrating another form of weight for holdingthe springs in a compressed condition.

Like numerals of reference designate corresponding parts in the severaliigures of the drawing. I y

Referrinto the accompanying drawing in which 1s illustrated thepreferred embodiment of the invention, l designates a couplin theA saety device and having interiorly threaded terminal portions 2 for therecepmember constituting the body of' tion ,of the threaded ends 3 ofsections or members 4: of the inner reciprocatory tube of the oil, pump.The inner tube which designed to be reciprocated within the outer wellcasing 5 by the usual operating mech-.

anism is of the ordinary construction and the coupling member or tubularbody l of the safety device is provided at diametrically opposite pointswith upwardly tapered recesses G 4for the reception of upwardly taperedautomatically operable dogsl or catches 7, which when the operatingmechanism of the oil pump operates, is caused to have a relativemovement longitudinally ofthe inner reciprocatory tube and the body orcoupling member l, whereby the dogs or catches are wedged between thebody or coupling member and the weli casing to hold the inner tube andprevents the same from dropping to the bottom of the well. The recess 6presents an inclined wall to the inner face of the" wedge shaped dog orcatch 7. and ,it form a horizontal shoulder or face 8 upon which thecatch or dog normally rests. The catch or dog presents an inclined innerface to the body or coupling member l and'it is substantially segmentalin cross section as'clearly illustrated in Fig. 3 of the drawing, and itis provided at its curved outer facewith horizontal teeth which areshouldered at the bottom and whichare curved horizontally ortransversely to conform tol the contigui-ation of the interior of thewell casing. The dogs or catches are. slidably r interlocked with thetubular body or coupling member l by means of longitudinally or catches.The couplingrmernber or body is preferably rectangular in cross" sectionas shown in l? and the dogs or catches are located at tvvo or" the flatside faces orf' the said coupling rnenibei' or bocly, the ether twofeces being eclepted to be engaged by Wrench or other tool. The. dogs orcatches which are shown. in their engaging position in Fig. l of thedrawing, normally rest upon the shoulders 8 of the body or cou- ,blingmember, which is provided at the said shoulders with sockets l2extending clown warilly from the said shoulders and receiving coiledsprings lf3. The eoilecl springs 13 ivliieli engage the lower ends ofthe dogs or cartones are maintained normally compressed. by s, ii/eig tl5 located above the dog or cato-lies and provided with arms lbextending downwardly et opposite sides of the 'tubular body or couplingmember and Quiclecl in vertical Vmmoves 17 thereof.,4 The springs may besupported by inclined pins ittefl into the lower ends of the dogs orcatches ancl extending into the sockets l2 of tbe coupling member orbody l. The sockets lll are forme/l in the lower terminals of tbe clogsor catches and tlie arms 16 are preferably formed, inteeral with asleeve 18 interiorly threaded alt/19 for engaging the lower threaded en'cl 20 of the Weight which is preferably in the form of a piece of pipeor tubing but the arms may be formed in\ tegral with tbe Weight as shownat 21 in IFig. fl of tbe drawing" and as illustrated in 'the aforesaidapplication. The Weight and 'tbe clogs or catches ere just sufficient tomaintain the coiled springs normally oombut when the operating mechanismbreaks and the inner tubeY l0 should 'drop the Well.

Witb. a sudden movement, there is a relative upward or outward movementof the dogs oi catches to cause tlieni to lrmly engage grip the wellcasing whereby theA clownwarcl movement of the inner reciprocatory tubeis checked and suoli tube eectuall prevented from dropping 'to thebottoni of ln this operation the clogs or cetclies are relieved of theaction of the lwciglit su'l'iciently to enable the springs to engagementwith the Well casing.

operate automatically ano*- throw them into "What is claimed is l. .la apump of the class described, the

lcombination with a Well casing, and an inner reciprocatory tube, of asafety device comprising a coupling member carried by the inner tube,dogs or catches mounted on narices@ the coupling memberancl eri'engeelenu gage the well casing, springs ornrging the dogs or catches in suchengagement, Weight located above tbe coupling member and provided witharms engaging tbe catches.

2. ln a pump of the cla.ss iescribefl, tbe combination with a Wellcasing, and an inner tubefo e safety device inclucliii' o posite dogs orcatches carried by the innen inner tube, of a safety device comprisinga.

body having opposite inclined faces, clogs or catches movable upwardlysind dovrin/ vverclly on the body, at the seid inclinedy faces, a Weightfor urging dogs or catches downwardly to holrl tbe sanne ont ofengagement With the well casing ariel spring normally compressed by theclogs or catches and the. Weight and adapted erben tbe dogs or catchesare relieved of the Weight to movethe (logs or catches u lo- Wardly withrespect to the saiol inclined faces ancl cause the dogsi'or catches tobe thrown into engagement with the Well casinow 4, ln a pump of theclass described, the combination With a Well casing, and. an inner tube,of a safety cle-vice comprising a couplingl member having a shoulderprovided above the saine with grooves, said coupling member beingproviclecl bet-Ween the shoulders and the grooves with inclined faces,dogs or catches slidable on the coupling member at the said. inclinedfacce, springsinountefl on the coupling member at tlie said shoulderv-ancl arranged to non inally compressed by tlie clogs or catches and aWeight located above the clogs or catches and having aigus arrangedv insaid grooves" and tting against tbed dogs or,

catches to enable the seine to said springs.

ln testimony Wnereof l allie; .my signature in presence of twoWitnesses.

' KENNETH D. FULLER.

compress tbe Witnesses:

CHARLES Kane, W'. E; FRANTa..

